Safety resilient means for machinery subjected to high stresses, particularly for rolling mills, calenders and the like



Dec. 23, 1958 c. MONTAGNA 2,865,628

SAFETY RESILIENT MEANS FOR MACHINERY SUBJECTED TO HIGH STRESSES,PARTICULARLY FOR ROLLING MILLS, CALENDERS AND THE LIKE Filed Aug. 4,1955 I INVENTOR Carlo fifanayiza,

BY flyuu 5. 92a

ATTORNEY United Sttes Patent LY FOR RDLLING MILLS, CALENDERS AND THELIKE Carlo Montagna, Dalmine, Italy, assignor to Dalmine S. p. A.,Milan, Italy, a corporation of Italy Application August 4, 1955, SerialNo. 526,479 Claims priority, application Italy September 9, 1954 3Claims. (Cl. 267-1) The present invention has as an object a safetyresilient means for machinery subjected to high stresses, such asrolling mills, calenders, presses and the like in which high pressureshave to be exerted and the material is at the same time forced toundergo a pre-established deformation.

It is obvious that during operation eventual changes in the temperatureof the material and, in some cases, an imperfect or disturbed setup ofthe machinery can originate etforts so high as to exceed the valuesforeseen by the designer and cause damage to the machinery or equipment,sometimes in an irrepairable way. The matter is so much more importantin that it is not generally possible to foresee by theoreticalcalculation the magnitude of the normal working stresses and of thepercentage of their increase deriving from various abnormal workingconditions.

In order to prevent this serious danger there are already in use somesafety devices constituted by metal blocks, generally of cast iron orsteel, interposed in the chain of the organs originating the stressesand which should break when the stress attains a pre-establishedmagnitude. However, it happens in practice that the breaking strain ofthe said blocks is not determinable, even only within a reasonableapproximation, and they, therefore, break prematurely, causing theoperation to be interrupted for no suflicient reason, or, on thecontrary, they result too resistant and determine the breakage of theorgans they should have protected.

This twofold defect is remedied by the safety elastic means according tothe invention, in which a suitably formed housing contains metallic barsarranged at an angle with the direction of the force to be transmittedand alternating with rubber cushions apt to exert an efiort in atransversal direction. The advantages of this solution in thepossibility of having an elastic means apt to withstand high specificpressures, this end not being attainable with other means known atpresent.

The device in question absorbs the peak loads up to a certain value,this increasing the extension of the working diagram.

For greater clarity reference is made to the attached drawing,representing a cross-sectional elevation of an embodiment of the elasticsafety means of the present invention.

In the drawing 1 indicates a substantially box-shaped body having forinstance a rectangular base constituting, together with the cover 2 acasing containing the elastic portion constituted by rigid rectangularpressure-transmitting metal bars 3, alternating with rubber cushions 4.The bars are inclined at a small angle with respect to the line ofaction of force 5. By effect of the force having such a direction aswill press the cover 2 towards the box 1, the bars 3 abutting bothagainst the cover 5 and the body 1 will tend to assume a greaterinclination, i. e. to cause said angle to increase, but this deformationwill be counteracted by the reaction originated by the compression ofthe rubber cushions 4, cooperating with the side walls of box 1,

2,865,628 Fatented Dec. 23, 1958 I claim:

1. A cushioning device comprising, in combination, a pair of parallelplate members movable towards and away from each other, one of saidplate members having at least one portion extending at an angletherefrom in direction towards the other plate member outside the pathof movement of the latter; a set of rigid pressuretransmitting elementsarranged between said plate members and having ends abutting,respectively, against the same, said rigid pressure-transmittingelements being inclined with respect to said plate members towards saidone portion of said one plate and being movable from a less-inclinedposition to a more inclined position when said plate members are movedtoward each other; means between the plate members guiding said membersfor substantially rectilinear movement toward and away from each other;and a set of elastic cushions located intermediate adjacentpressure-transmitting elements so that when said first and second platemembers move toward each other under the action of pressure against thesame, said rigid pressure-transmitting elements tend to turn to saidmore inclined position by compressing said elastic cushions, one of saidelastic cushions being located at one end of said set of rigidpressure-transmitting elements and abutting against said portionextending from one of said plate members.

2. A cushioning device comprising, in combination, a pair of movableparallel plate members, one of said plate members being formed as a boxwith side walls for guiding the other plate member for movement in thespace inside said walls; a set of rigid pressure-transmitting elementsarranged between said plate members and having ends abutting,respectively, against the same, said rigid pressure-transmittingelements being inclined with respect to said plate members and beingmovable from a less-inclined position to a more inclined position whensaid plate members are moved toward each other; and a set of elasticcushions located intermediate adjacent pressure-transmitting elements sothat when said first and second plate members move toward each otherunder the action of pressure against the same, said rigidpressure-transmitting elements tend to turn to said more inclinedposition by compressing said elastic cushions.

3. A cushioning device comprising, in combination, a pair of movableparallel plate members, one of said plate members being formed as a boxwith side walls for guiding the other plate member for movement in thespace inside said walls; a set of rigid pressure-transmitting elementsarranged between said plate members and having ends abutting,respectively, against the same, said rigid pressure-transmittingelements being inclined with respect to said plate members and beingmovable from a le s-inclined position to a more inclined position whensaid plate members are moved toward each other; and a set of elasticcushions located intermediate adjacent pressure-transmitting elements sothat when said first and second plate members move toward each otherunder the action of pressure against the same, said rigidpressuretransmitting elements tend to turn to said more inclinedposition by compressing said elastic cushions, one of said elasticcushions being located at either end of said set of rigidpressure-transmitting elements and adjacent to one 1 of said side walls.

References Cited in the file of this patent UNITED STATES PATENTS287,659 Gifford Oct. 30, 1883 2,108.746 Erichsen Feb. 15, 1938 2,356,246Jones Aug. 22, 1944 2,641,463 Mulcahy June 9, 1953 2,706,112 CarrierApr. 12, 1955

